Uneaten food decomposes, which can cloud your water. Feed your fish two to three times a day but no more than what your fish can eat in one to two minutes.
When you have too many fish in your tank, excess waste gives off ammonia and nitrites, which can also cloud your water.
We recommend one inch of (mature) tropical fish per gallon of water and one inch of (mature) goldfish for every three gallons. So a 10-gallon tank should have only 10 tropical fish that are one inch each, or one 3-inch goldfish.
New Tank Syndrome:
An inexperienced fish owner may not realize they have to prepare their new aquarium’s filter to handle fish waste through a process called “cycling.” An ineffective filter creates elevated levels of ammonia, which can harm the fish and result in cloudy water. So when you first set up your tank, be sure to condition and cycle your aquarium right away with SafeStart®.